Physics help........?

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kelly

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Four charged particles are placed so that each particle is at the corner of a square. The sides of the square are 17 cm. The charge at the upper left corner is +3. uc, the charge at the upper right corner is -7.0 uc, the charge at the lower left corner is -2.6 uc. and the charge at the lower right corner is -9.0 uc. The Coulomb constant is 8.98755 x 10^9 N* m^2/C^2.
What is the magnitude of the net electric force on the +3.0 uc charge? (In units of N)

Any help would be greatly appreciated
 
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